Miss Ins Fernndez has a budget of 200 euros per month to go to the discotheque and buy "pink" magazines. Her utility function is U = X₁ + lnX₂, where X₁ represents each time she goes to the discotheque, and X₂ each magazine she reads. If the prices are p₁ = 8 and p₂ = 4, then what would be the change in the quantity demanded of X₁ due to the Slutsky substitution effect if the price of the disco entrance increases to p₁ = 16 with the price of magazines being that of the statement (p₂ = 4)? The alternatives are: a) -12,5 b) 2 c) 12,5 d) -0,5 Please elaborate on your answer

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